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To help you understand this question, we will create a new temporary word. We will call every 4 pencils a "pencilor". So a "pencilor" cost 3 rupees.

How many "pencilor" is there in 20 pencils? Well, 20 = 4 x 5, meaning there are 5 groups of 4 => there are 5 "pencilors". If each "pencilor" cost 3 rupees, how much does 5 cost? 3 x 5 = 15 rupees. And you are done.

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Q: How much do 20 pencil cost if 4 pencils cost rupees three?
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